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Additive interactions in the stabilization of film grade high‐density polyethylene. Part II: Stabilization during long‐term service
Author(s) -
Parrondo Aitor,
Allen Norman S.,
Edge Michele,
Liauw Christopher M.,
Fontán Eusebio
Publication year - 2002
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.10350
Subject(s) - stearate , zinc stearate , low density polyethylene , polyethylene , dichloromethane , zinc , polymer , antioxidant , high density polyethylene , materials science , phenol , organic chemistry , chemical engineering , chemistry , raw material , solvent , engineering
In the second part of this study, the performance of phenol/phosphite/zinc stearate packages and the contribution of each additive to the long‐term thermal stabilization and photostabilization were evaluated in high‐density polyethylene produced by using Phillips catalyst technology. Infrared spectroscopy, ultraviolet spectroscopy, and yellowness index measurements were used to establish the performance of the different additive packages. The HPLC analysis of dichloromethane extracts of the polymer was carried out after melt processing in order to determine the amount of phenolic antioxidant remaining in the samples. The long‐term thermal stabilization was dependent only upon the phenolic antioxidant concentration, whereas both phenolic antioxidants and phosphites contributed directly to photostabilization. Zinc stearate did not show any significant influence on the stabilization under either thermooxidative or photooxidative conditions.